Load Specifications
Bullet:.257 | 128gr | Hornady ELD-X
Bullet Manufacturer:Hornady
Bullet Weight:128 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.255 GS load data
Case Length (l3):2.165"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:62 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:8.0
Load data in caliber .255 GS with .257 | 128gr | Hornady ELD-X bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Hodgdon Superformance.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 57,319 psi | 90% | 2723 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,216 psi | 87% | 2749 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2785 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,128 psi | 85% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,795 psi | 86% | 2838 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2986 fps | 98% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,418 psi | 85% | 2923 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 82% | 56,840 psi | 89% | 2812 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,520 psi | 85% | 2766 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,651 psi | 87% | 2877 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,490 psi | 84% | 2871 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,406 psi | 90% | 2940 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,811 psi | 87% | 2877 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,811 psi | 87% | 2877 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,085 psi | 86% | 2785 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,303 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,579 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,695 psi | 89% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,013 psi | 86% | 2867 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2871 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,211 psi | 77% | 2805 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,960 psi | 67% | 2733 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3002 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,826 psi | 89% | 2831 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,674 psi | 75% | 2792 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 55,782 psi | 87% | 2802 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2871 fps | 98.1% |
| Bofors RP7 | <<locked>> | 90% | 55,288 psi | 87% | 2789 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 56,434 psi | 88% | 2822 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,840 psi | 89% | 2887 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 56,869 psi | 89% | 2851 fps | 98.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 2877 fps | 96.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2858 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 82% | 57,522 psi | 90% | 2818 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,753 psi | 87% | 2815 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,580 psi | 90% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,290 psi | 90% | 2930 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 57% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,737 psi | 86% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,435 psi | 90% | 2799 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,492 psi | 89% | 2782 fps | 99.4% |
| IMR 4350 | <<locked>> | 94% | 56,188 psi | 88% | 2822 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,029 psi | 89% | 2815 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 55,347 psi | 87% | 2831 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,710 psi | 89% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,187 psi | 86% | 2808 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2844 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 57,334 psi | 90% | 2782 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,593 psi | 87% | 2733 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,653 psi | 90% | 2792 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,942 psi | 89% | 2812 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 54,853 psi | 86% | 2802 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,482 psi | 68% | 2641 fps | 98.4% |
| Norma 201 | <<locked>> | 82% | 55,434 psi | 87% | 2753 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,101 psi | 88% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,592 psi | 86% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,913 psi | 89% | 2874 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 55,158 psi | 86% | 2949 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 57,217 psi | 90% | 2877 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,506 psi | 87% | 2822 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,894 psi | 80% | 2854 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 94% | 55,709 psi | 87% | 2877 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,353 psi | 71% | 2733 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 58% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,463 psi | 88% | 2808 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,550 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,260 psi | 88% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,520 psi | 85% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,840 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,756 psi | 65% | 2746 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 84% | 56,246 psi | 88% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,057 psi | 88% | 2802 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,450 psi | 90% | 2848 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 98% | 54,085 psi | 85% | 2851 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,288 psi | 87% | 2789 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,942 psi | 89% | 2812 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,334 psi | 90% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,653 psi | 90% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,853 psi | 86% | 2802 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,464 psi | 90% | 2858 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,317 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,231 psi | 88% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,956 psi | 89% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,913 psi | 89% | 2766 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 2907 fps | 98.8% |
| Somchem S335 | <<locked>> | 82% | 55,956 psi | 88% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,854 psi | 88% | 2792 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,550 psi | 87% | 2789 fps | 96.5% |
| Somchem S365 | <<locked>> | 96% | 56,347 psi | 88% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,882 psi | 86% | 2831 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 56,739 psi | 89% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,333 psi | 88% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,753 psi | 89% | 2726 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,159 psi | 90% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,709 psi | 87% | 2818 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,401 psi | 79% | 2746 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 54,824 psi | 86% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,911 psi | 86% | 2828 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2881 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 2940 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,405 psi | 87% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,232 psi | 90% | 2894 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,338 psi | 69% | 2861 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,230 psi | 87% | 2789 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 2825 fps | 98.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 50,705 psi | 79% | 2638 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,472 psi | 76% | 2641 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 32,634 psi | 51% | 2411 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 48,066 psi | 75% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,332 psi | 57% | 2510 fps | 98.1% |
| Accurate High Country | <<locked>> | 94% | 46,383 psi | 73% | 2802 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 98% | 50,763 psi | 80% | 2864 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 53,287 psi | 84% | 2759 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,382 psi | 71% | 2618 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 43,047 psi | 67% | 2654 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 96% | 46,659 psi | 73% | 2749 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,719 psi | 78% | 2825 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,018 psi | 67% | 2654 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,018 psi | 67% | 2654 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,803 psi | 72% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,834 psi | 77% | 2707 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,607 psi | 56% | 2520 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,176 psi | 63% | 2641 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,525 psi | 67% | 2648 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,569 psi | 67% | 2694 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,121 psi | 41% | 2283 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,286 psi | 52% | 2500 fps | 95.9% |
| Alliant Reloder-26 | 42.5 gr | 82% | 29,515 psi | 46% | 2438 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,910 psi | 83% | 2772 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 41,989 psi | 66% | 2680 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 45,905 psi | 72% | 2651 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,569 psi | 67% | 2694 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 40,596 psi | 64% | 2526 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,224 psi | 72% | 2661 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,276 psi | 60% | 2552 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 41,263 psi | 65% | 2572 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 49,995 psi | 78% | 2759 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 48,979 psi | 77% | 2743 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 53,882 psi | 84% | 2766 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,982 psi | 52% | 2415 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,444 psi | 79% | 2749 fps | 100% |
| Hodgdon Superformance | 42.8 gr | 80% | 37,260 psi | 58% | 2562 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,590 psi | 81% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,747 psi | 75% | 2651 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,951 psi | 78% | 2677 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 38,493 psi | 60% | 2503 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,843 psi | 66% | 2556 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 34,867 psi | 55% | 2464 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 50,067 psi | 78% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,776 psi | 76% | 2703 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 47,616 psi | 75% | 2782 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 53,650 psi | 84% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,112 psi | 82% | 2684 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,718 psi | 75% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,624 psi | 62% | 2510 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 37,768 psi | 59% | 2490 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 33,794 psi | 53% | 2438 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 52,243 psi | 82% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,852 psi | 83% | 2703 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,182 psi | 76% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,424 psi | 68% | 2644 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 36,637 psi | 57% | 2592 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,274 psi | 57% | 2507 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 48,327 psi | 76% | 2717 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,413 psi | 74% | 2789 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,201 psi | 55% | 2493 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 39,349 psi | 62% | 2608 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,238 psi | 72% | 2641 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,837 psi | 83% | 2825 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,714 psi | 67% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,911 psi | 56% | 2523 fps | 97.7% |
| ReloadSwiss RS 70 | 41.1 gr | 80% | 35,085 psi | 55% | 2530 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,059 psi | 61% | 2680 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 49,632 psi | 78% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,352 psi | 68% | 2602 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,674 psi | 75% | 2690 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 90% | 41,611 psi | 65% | 2631 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,596 psi | 64% | 2526 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,624 psi | 62% | 2510 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,650 psi | 84% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,718 psi | 75% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,768 psi | 59% | 2490 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,440 psi | 70% | 2651 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,880 psi | 81% | 2733 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,939 psi | 83% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,701 psi | 70% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,711 psi | 61% | 2454 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,220 psi | 65% | 2625 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 52,823 psi | 83% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,743 psi | 69% | 2602 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,863 psi | 77% | 2680 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,721 psi | 51% | 2464 fps | 99.6% |
| Somchem S385 | <<locked>> | 88% | 39,566 psi | 62% | 2559 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 53,461 psi | 84% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,835 psi | 78% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,111 psi | 79% | 2638 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,698 psi | 65% | 2533 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,594 psi | 59% | 2507 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 38,943 psi | 61% | 2536 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,182 psi | 76% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,999 psi | 58% | 2503 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,398 psi | 45% | 2352 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 48,544 psi | 76% | 2818 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,695 psi | 57% | 2474 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 38,276 psi | 60% | 2552 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,584 psi | 39% | 2306 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,735 psi | 81% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,684 psi | 65% | 2598 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 105 powders for .255 GS loaded with the .257 | 128gr | Hornady ELD-X. Alliant Reloder-26 delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,729 fps to 3,002 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 128.0 gr projectile in 0.257" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .255 GS with the .257 | 128gr | Hornady ELD-X they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.